JP3875611B2 - Facsimile device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a line side circuit connected to the line and a main control unit side circuit connected to the facsimile apparatus main body side are formed of semiconductor elements, and the handset can be connected to the main control unit side circuit. The present invention relates to a facsimile apparatus including a line IF unit.
[0002]
[Prior art]
Conventionally, in a facsimile apparatus, a line IF unit is provided in order to provide an interface (IF) between the line and the facsimile apparatus main body. In the line IF unit, impedance matching between the modem and the line and a circuit on the line side are provided. A transformer terminated with 600Ω is used for the purpose of isolation between the circuit on the modem side and the circuit on the modem side, and between the circuit on the line side and the circuit on the modem side in each tone signal of the CNG signal / FC signal / DTMF signal Two transformers of a transformer terminated with high impedance are used for transmission and insulation (see Patent Document 1 and Patent Document 2).
[0003]
However, recently, application of a semiconductor DAA (DAA: Data Access Arrangement) that does not use a transformer by converting the analog circuit of the line IF unit into a semiconductor has been studied, and the circuit is simplified / downsized and the cost is reduced.
[0004]
FIG. 7 is a diagram showing a schematic configuration of a facsimile apparatus having a line IF unit 100 formed of such a semiconductor DAA. A line side circuit 113 is provided on the line 2 side, and a main control unit side circuit 115 is provided on the facsimile apparatus main body side. These are provided, and these are connected by two coupling insulating portions 114.
[0005]
[Patent Document 1]
JP-A-5-122428 [Patent Document 2]
JP-A-8-139866 [0006]
[Problems to be solved by the invention]
However, when the handset 116 is attached to the main control unit side circuit 115, two coupling insulators 114 are required for the facsimile main body side and for the handset side. For example, the capacitor has to be formed using a capacitor having a high withstand voltage from the standard, which causes a problem of increasing the cost and preventing the line IF unit 100 from being downsized.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a facsimile apparatus that can be reduced in size and cost by requiring only one insulating part for coupling even when the handset is mounted on a main control unit side circuit. .
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is a circuit comprising a semiconductor DAA and provided on the line side, a circuit comprising a semiconductor DAA and provided on the main body side of the facsimile apparatus, A line interface unit that is formed by a coupling insulating unit that couples the circuit on the line side and the circuit on the main control unit side, and that performs network control and the like as an interface between the line and the facsimile apparatus main body, and on the main control unit side In a facsimile apparatus in which a handset can be connected to a circuit, a plurality of signals for switching signals between the facsimile apparatus main body and the handset so that the facsimile apparatus main body and the handset can communicate with each other through one coupling insulating portion. Even if the switch is provided and the handset is attached to the main control unit side circuit, Characterized in that to allow size and cost of the apparatus so as to requires only one.
[0009]
According to the second aspect of the present invention, the main control is performed by A / D converting the analog signal received by the line side circuit via the line so that the line side circuit and the main control unit side circuit transmit and receive digital signals. A line-side CODEC is provided in the line-side circuit for outputting a digital signal input from the main control unit-side circuit and D / A converting it to the line, and an analog signal from the handset is A A handset side CODEC which performs D / A conversion and outputs the digital signal from the main control unit side circuit to the handset after D / A conversion is provided in the main control unit side circuit. It is characterized by.
[0010]
The invention according to claim 3 is transmitted to the circuit on the circuit side and the circuit on the main control unit side so that both the digital signal such as the facsimile communication signal and the analog signal such as the handset call signal can be transmitted by the coupling insulating unit. An A / D signal changeover switch is provided in which changeover control is performed depending on whether the signal is a digital signal or an analog signal.
[0011]
The invention according to claim 4 is characterized in that the main control unit side circuit is provided with a transmission / reception amplifier for adjusting the gain of a signal transmitted and received between the main control unit side circuit and the handset.
[0012]
In the invention according to claim 5, the multiple signal changeover switch or the A / D signal changeover switch is controlled so as to connect the main control unit side circuit and the handset when the handset call signal is detected. When a line control signal such as a hook signal and a ringing signal from the circuit and a facsimile communication signal are detected, switching control is performed so as to connect the main control unit side circuit and the facsimile apparatus main body.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a facsimile apparatus according to the present invention.
[0014]
The facsimile apparatus 1 includes a main control unit 10, a modem 12, a ROM 13, a RAM 14, an image information memory 15, an encoding / decoding unit 16, a reading unit 17, a recording unit 18, an operation unit 19, a display unit 20, and the like. These are connected to each other by a system bus.
[0015]
Further, a line IF unit 11 is connected to the main control unit 10, and a line 2 is connected to the line IF unit 11.
[0016]
Further, the facsimile apparatus 1 is provided with a handset 3 that can be attached. The handset 3 is connected to the line IF unit 11 and the modem 12.
[0017]
The ROM 13 is a read only memory in which a control program for the main control unit 10 to control each part of the apparatus is stored.
[0018]
The RAM 14 is a random access memory used as a work area for the main control unit 10. Note that the RAM 14 is preferably backed up by a backup circuit (not shown) so that the stored contents are retained even when the apparatus power is shut off.
[0019]
The main control unit 10 controls each part of the apparatus such as the encoding / decoding unit 16, the reading unit 17, and the line IF unit 11 while using the RAM 14 as a work area according to the control program written in the ROM 13.
[0020]
The image information memory 15 is a SAF memory for a compressed data memory that temporarily stores the image information read by the reading unit 17 as a file for transmission to the memory, and is temporarily stored as a file until the received image information is recorded by the recording unit 18. In addition, a buffer page memory or the like for developing raw data when storing and recording data is provided.
[0021]
The encoding / decoding unit 16 compresses transmission image information by a predetermined encoding method such as an MH / MR / MMR encoding method, while compressing received image information by a predetermined decoding method such as an MH / MR / MMR decoding method. It expands by the method.
[0022]
The reading unit 17 reads image data at a predetermined reading line density such as 3.85 lines / mm, 7.7 lines / mm, and 15.4 lines / mm to obtain image information. Information is temporarily stored in a line buffer once and transferred to a required device.
[0023]
The recording unit 18 records and outputs the received image information according to the linear density, and records and outputs the image information read by the reading unit 17 according to the linear density (copy operation). Also used for management report output.
[0024]
The operation unit 19 includes a numeric keypad for designating a destination telephone number, a start key, a one-touch dial key, and various other keys, and an operation state of the device to be notified to the user and various messages are a display unit formed from a liquid crystal / LED or the like 20 is displayed.
[0025]
The modem 12 modulates data transmitted to the line 2 via the line IF unit 11 and demodulates data received from the line 2 via the line IF unit 11.
[0026]
The handset 3 is connected to the secondary side (main control unit side circuit 40 described later) of the line IF unit 11 and performs a call via the line 2.
[0027]
The line IF unit 11 controls the line 2 at the time of an incoming / outgoing call from the main control unit 10, and in recent years, a semiconductor DAA whose function is realized by a semiconductor process has been used. In addition, although there exist various semiconductors, such as Si and GaAs, as a semiconductor, in the following description, this semiconductor element is described as SiDAA. However, it is added that the present invention is not limited to this Si.
The configuration of the line IF unit 11 will be described with reference to FIG. The line IF unit 11 mainly includes a line side circuit 30, a main control unit side circuit 40, and a coupling insulating unit 23 that performs signal transmission while electrically isolating the line side circuit 30 and the main control unit side circuit 40. In the configuration, the line side circuit 30 and the main control unit side circuit 40 are formed of SiDAA.
[0029]
In addition, the line IF unit 11 includes a diode bridge 21 that is a full-wave rectifier that rectifies the polarity of the DC loop current in the line 2 in one direction, and a hook switch that is formed by a high voltage MOSFET and puts the modem 12 in an off-hook state. 22 etc. are provided.
[0030]
In recent years, a DSP (Digital Signal Processor) is used in the modem 12 from the viewpoint of performing modulation / demodulation at high speed.
[0031]
The signal handled by the DSP is a digital signal. When the line 2 is an analog signal, conversion between the analog signal and the digital signal (A / D conversion, D / A conversion) is required. The SiDAA is roughly classified into two types depending on whether the CODEC is provided in the line side circuit 30 or on the modem 12 side (meaning from the main control unit circuit 40 to the facsimile apparatus main body side). .
[0032]
That is, when the CODEC is provided in the line side circuit 30, the line side circuit 30 and the main control unit side circuit 40 are configured to transmit and receive digital signals, and a high-insulation capacitor is generally used as the coupling insulating unit 23. Used.
[0033]
On the other hand, when the CODEC is provided in the modem 12, the line side circuit 30 and the main control unit side circuit 40 are configured to transmit and receive analog signals, and a photocoupler or the like is generally used for the coupling insulating unit 23. It is done.
[0034]
In the present embodiment, a case where the CODEC is provided in the line side circuit 30 as shown in FIG. 2 will be described as an example, but it is added in advance that the present invention is not limited to this.
[0035]
The line side circuit 30 includes a ringing detection circuit 32, a current sensor 31, a hybrid network 36, a reception amplifier 35, a transmission amplifier 34, a termination resistor 33, a line side insulation IF 38, and the like, and operates by pole feeding.
[0036]
The ringing detection circuit 32 is for detecting ringing. When a ringing signal arrives at the ringing detection circuit 32 from the line 2, a signal of the same cycle is output to the control IF 42 via the line side insulation IF 38, the capacitor 24 of the coupling insulation part 23, and the main control part side insulation IF 41. Then, the control IF 42 outputs a ring detection signal (H） L) whose level is inverted to the main control unit 10 so that ringing can be detected.
[0037]
The current sensor 31 detects off-hook. When the facsimile communication / handset call is started by going off-hook, a DC loop current flows through the line 2. Therefore, the DC loop current is detected, and the detection signal is output to the control IF 42 via the line side insulation IF 38, the capacitor 25, and the main control unit side insulation IF 41, and the hook detection signal is output from the control IF to the main control unit 10. Input and off-hook is detected.
[0038]
The hybrid network 36 includes a two-wire / four-wire conversion circuit that separates a facsimile signal / handset call signal from the line 2 into a transmission signal and a reception signal, a canceller circuit and a filter circuit that suppress the transmission signal from being circulated into the reception path. Etc.
[0039]
The reception amplifier 35 and the transmission amplifier 34 adjust the gain of the transmission signal and the reception signal.
[0040]
The termination resistor 33 is a high-resistance resistor that determines the termination impedance of the line 2, and its specification is determined by the communication standards of each country.
[0041]
The line-side CODEC 37 performs A / D conversion and D / A conversion of the facsimile signal / handset call signal. Since the line-side CODEC 37 is provided in the line-side circuit 30, the coupling insulating section 23 transmits digital signals, and high-insulation capacitors 24 and 25 are used. In order to simplify the circuit, a serial signal is used. It is configured to transfer.
[0042]
The hook switch 22 is formed of a high breakdown voltage MOSFET or the like, and is used to put the modem 12 in an off-hook state. When the facsimile communication / handset call is started, a hook switch control signal is input from the main control unit 10 to the hook switch 22 via the control IF 42, the main control unit side insulation IF 41, the capacitor 24, and the line side insulation IF 38, and the hook switch 22 is connected. Is controlled to ON.
[0043]
Further, the hook switch 22 is also turned on / off at a constant interval to serve as a dial pulse transmission.
[0044]
The line side insulation IF 38 unifies the hook detection signal from the current sensor 31, the ringing detection signal from the ringing detection circuit 32, and the facsimile signal / handset call signal from the line side CODEC 37 into a serial signal for the capacitor 25, and A serial signal from the capacitor 24 is separated into a hook switch control signal to the hook switch 22 and a facsimile signal / handset call signal to the line side CODEC 37.
[0045]
The main control unit side circuit 40 includes a main control unit side insulation IF 41, a control IF 42, a TX / RXIF 43, a multiple signal changeover switch 44, and the like, and is supplied with power from the main body of the facsimile apparatus 1.
[0046]
The main control unit side insulation IF 41 has a function opposite to that of the line side insulation IF 38. The facsimile signal / handset call signal to the TX / RXIF 43, and the detection signal to the control IF 42 are serial signals from the capacitor 25, respectively. In addition, the facsimile signal / handset call signal from the TX / RXIF 43 and the control signals from the control IF 42 are unified into a serial signal for the capacitor 24.
[0047]
The control IF 42 performs an interface with the main control unit 10.
[0048]
The TX / RXIF 43 is provided in front of the modem 12 or the handset 3 and serves as an interface with the modem 12 or the handset 3.
[0049]
The multi-signal selector switch 44 is controlled by a multi-signal selector switch control signal from the main control unit 10, and its common terminal is connected to the TX / RXIF 43, one switching terminal is connected to the modem 12, and the other switching terminal is connected to the handset IF. The handset 3 is connected via the unit 50.
[0050]
As a result, handshaking is performed by serial communication between the TX / RXIF 43 and the modem 12 and between the TX / RXIF 43 and the handset IF unit 50 by serial communication. In this case, the line 2 and the handset 3 are switched to be connected. In the standby state, the modem 12 and the line are connected as shown in FIG.
[0051]
The multi-signal selector switch 44 can be formed of a semiconductor element such as a MOSFET, and in this case, it can be easily incorporated into the main control unit side circuit 40 formed of a semiconductor as well. There is an advantage that can be achieved.
[0052]
The reason why the modem 12 and the line are set to be connected in the standby state is to enable use in a facsimile machine that does not have the handset 3.
[0053]
The handset IF unit 50 A / D converts the analog signal from the handset 3 into a digital signal for the main control unit side circuit 40, while the digital signal from the main control unit side circuit 40 is converted into an analog signal for the handset 3. A handset side CODEC 51 that performs D / A conversion, a transmission amplifier 52 that performs gain adjustment of signals exchanged between the handset 3 and the handset side CODEC 51, and a reception amplifier 53 are provided.
[0054]
By controlling the multiple signal selector switch 44 in this way, the connection destination of the TX / RXIF 43 can be switched between the modem 12 and the handset IF unit 50. Therefore, as shown in FIG. There is no need to provide the insulating IF and the coupling insulating portion, so that the size can be reduced and the cost can be reduced.
[0055]
In the above description, the handset IF unit 50 is configured separately from the main control unit side circuit 40. However, the present invention is not limited to this. For example, as shown in FIG. You may provide in the control part side circuit 40 (namely, the structure which integrated the handset side CODEC51 in the main control part side circuit 40).
[0056]
Further, as shown in FIG. 4, not only the handset side CODEC 51 but also the transmitting amplifier 52 and the receiving amplifier 53 may be provided in the main control unit side circuit 40 (that is, the handset IF unit 50 is provided in the main control unit side circuit 40). Built-in configuration).
[0057]
Thus, by providing the handset side CODEC 51, the transmission amplifier 52, the reception amplifier 53 and the like in the main control unit side circuit 40, it becomes possible to further reduce the size and reduce the cost.
[0058]
Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, regarding the same structure as 1st Embodiment mentioned above, the same code | symbol is used and description is abbreviate | omitted suitably.
[0059]
In the first embodiment, two CODECs, that is, the line side CODEC 37 of the line side insulation IF 38 and the handset side CODEC 51 of the handset IF unit 50 are necessary.
[0060]
Therefore, in the present embodiment, facsimile communication / handset call can be performed by one CODEC.
[0061]
FIG. 5 is a block diagram showing the configuration of the line IF unit 11 in the facsimile apparatus applied to the description of the present embodiment. Compared with FIG. 2, the line side circuit 30 includes the line side A / D switch 60. Further, a circuit side analog insulation IF 62 is additionally provided, and a main control portion side A / D switch 63 and a main control portion side analog insulation IF 64 are additionally provided in the main control portion side circuit 40.
[0062]
The line side digital isolation IF 61 and the main control unit side digital IF 65 have the same configuration as the line side isolation IF 38 and the main control unit side IF 41 described above, but the circuit side analog isolation IF 62 and the main control unit side analog In order to distinguish from the insulated IF 64, the difference is specified by adding a digital name.
[0063]
In order to transmit an analog signal, it is necessary to be differential, so that the capacitors 25 and 27 of the highly insulating coupling insulating portion 23 are used during transmission, and the high insulation capacitors 24 and 26 are used during reception.
[0064]
On the other hand, since it is not necessary to be differential in order to transmit a digital signal, the capacitor 25 of the highly insulating coupling insulating portion 23 is used at the time of transmission and the high insulating capacitor 24 is used at the time of reception.
[0065]
The circuit-side analog isolation IF 62 is an isolation IF for the analog signal of the line-side circuit 30, and performs modulation to transmit the handset call signal output from the reception amplifier 35 through the coupling insulating unit 23 as an analog signal. On the other hand, for demodulating the modulated signal transmitted through the coupling insulating unit 23 as an analog signal from the handset call signal output from the handset 3 through the handset IF unit 50, and adding it to the transmission amplifier 34 It is.
[0066]
The main control unit side analog isolation IF 64 is an isolation IF for the analog signal of the main control unit side circuit 40 and has a function opposite to that of the circuit side analog isolation IF 62 of the line side circuit 30.
[0067]
The line side A / D switch 60 and the main control unit side A / D switch 63 are controlled in conjunction with an A / D signal changeover switch control signal from the main control unit 10.
[0068]
The line side A / D switch 60 is controlled by the control signal from the main control unit 10 to the control IF 42, the main control unit side digital insulation IF 65, the main control unit side A / D switch 63, the capacitor 24, The signal is input to the line-side digital insulation IF 61 via the line-side A / D switch 60 and controlled by the line-side digital insulation IF 61.
[0069]
Control of the main control unit side A / D switch 63 is input from the main control unit 10 to the main control unit side digital insulation IF 65 via the control IF 42 and controlled by the main control unit side digital insulation IF 65.
[0070]
In the standby state, the state shown in FIG. 5 is established, so that the line A / D switch 60 and the main control unit side A / D switch 63 need not be controlled in the facsimile apparatus not having the handset 3. ing.
[0071]
Accordingly, in a facsimile apparatus that does not have the handset 3, it is not necessary to be aware of the line side A / D switch 60 and the main control unit side A / D switch 63, so that a control program can be easily created.
[0072]
When performing line control such as facsimile communication, A / D signal changeover switch control, ringing / hook detection / hook switch control, etc., the digital insulation IF side is maintained (the state shown in FIG. 5) and a handset call is performed. Is switched to the analog insulation IF side.
[0073]
Further, the line side A / D switch 60 and the main control unit side A / D switch 63 are made into semiconductors, and are incorporated in the line side circuit 30 and the main control unit side circuit 40, respectively, thereby reducing the size and cost. Is planned.
[0074]
As described above, by providing the line side A / D switch 60, the main control unit side A / D switch 63, and the like, it becomes possible to perform facsimile communication / handset communication with one CODEC.
[0075]
Also in the present embodiment, as shown in FIG. 6, the handset IF unit 50 can be incorporated into the main control unit side circuit 40, and this configuration enables downsizing and cost reduction.
[0076]
【The invention's effect】
As described above, according to the first aspect of the present invention, a plurality of signals for switching signals between the main body of the facsimile apparatus and the handset so that the main body of the facsimile apparatus and the handset can communicate via one coupling insulating portion. Since the changeover switch is provided, even if the handset is attached to the main control unit side circuit, only one coupling insulating unit is required, and thus the size and cost of the apparatus can be reduced.
[0077]
According to the second aspect of the present invention, the analog signal received by the line side circuit via the line is A / D converted so that the line side circuit and the main control unit side circuit transmit and receive digital signals. A line side CODEC that outputs to the line after D / A conversion of the digital signal input from the main control side circuit is provided in the line side circuit, and is output to the main control side circuit, and an analog signal from the handset A / D conversion and output to the main control unit side circuit and a digital signal from the main control unit side circuit D / A conversion and output to the handset is provided in the main control unit side circuit These can be formed as one chip, and the size and cost of the apparatus can be reduced.
[0078]
According to the invention of claim 3, the circuit on the circuit side and the circuit on the main control unit side so that both the digital signal such as the facsimile communication signal and the analog signal such as the handset call signal can be transmitted by the coupling insulating unit. The A / D signal selector switch that controls the switching according to whether the transmission signal is a digital signal or an analog signal is provided, so that overlapping parts can be used together, thereby reducing the size and cost of the apparatus. Is possible.
[0079]
According to the invention of claim 4, since the main control unit side circuit is provided with the transmission / reception amplifier for adjusting the gain of the signal transmitted and received between the main control unit side circuit and the handset, these are 1 Since it can be formed in a chip, the size and cost of the device can be reduced.
[0080]
According to the invention of claim 5, the multiple signal selector switch or the A / D signal selector switch is controlled to connect the main control unit side circuit and the handset when a handset call signal is detected, When a line control signal and a facsimile communication signal such as a hook signal and a ringing signal from the line side circuit are detected, the switching control is performed so as to connect the main control side circuit and the facsimile apparatus main body. Overlapping parts can be used together, and the size and cost of the apparatus can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a facsimile apparatus applied to an embodiment of the present invention.
FIG. 2 is a block diagram showing a schematic configuration of a line IF unit applied to the description of the first embodiment.
FIG. 3 is a block diagram showing a schematic configuration of a line IF unit having a configuration alternative to FIG. 2;
4 is a block diagram showing a schematic configuration of a line IF unit having a configuration in place of FIG. 2; FIG.
FIG. 5 is a block diagram showing a schematic configuration of a line IF unit applied to the description of the second embodiment.
6 is a block diagram showing a schematic configuration of a line IF unit having a configuration in place of FIG. 5. FIG.
FIG. 7 is a block diagram showing a schematic configuration of a line IF unit applied to the description of the prior art.
[Explanation of symbols]
3 Handset 10 Main Control Unit 12 Modem 30 Line Side Circuit 31 Current Sensor 32 Ringing Detection Circuit 37 Line Side CODEC
38 Line side isolation IF
23 Coupling insulation parts 24, 25, 26, 27 Capacitor 40 Main control part side circuit 41 Main control part side insulation IF
44 Multiple signal selector switch 50 Handset IF unit 51 Handset CODEC
52 Transmission amplifier 53 Reception amplifier 60 Line side A / D switch 61 Line side digital isolation IF
62 Line side analog isolation IF
63 Main controller A / D switch 64 Main controller analog isolation IF
65 Main control unit side digital isolation IF

Claims (5)

A line side circuit made of semiconductor DAA and provided on the line side, a main control part side circuit made of semiconductor DAA and provided on the facsimile apparatus main body side, and a connection for coupling these line side circuit and main control part side circuit In a facsimile apparatus comprising a line interface unit that is formed by an insulating unit and performs network control and the like as an interface between a line and a facsimile machine main body, and a handset is provided so as to be connectable to the main control unit side circuit ,
2. A facsimile apparatus comprising a plurality of signal changeover switches for switching signals between the facsimile apparatus main body and the handset so that the facsimile apparatus main body and the handset can communicate with each other through one coupling insulating portion. . An analog signal received by the line side circuit via the line is A / D converted into the main control side circuit so that the line side circuit and the main control side circuit transmit and receive digital signals. A line-side codec that outputs and outputs a digital signal input from the main control unit side circuit to the line is provided in the line-side circuit; and
An analog signal from the handset is A / D converted and output to the main control unit side circuit, and a digital signal from the main control unit side circuit is D / A converted and output to the handset. 2. The facsimile apparatus according to claim 1, wherein the facsimile apparatus is provided in a main control unit side circuit. The transmission signal is a digital signal to the line side circuit and the main control side circuit so that both the digital signal such as a facsimile communication signal and the analog signal such as a handset call signal can be transmitted by the coupling insulating unit. 2. The facsimile apparatus according to claim 1, further comprising an A / D signal changeover switch that performs switching control according to whether the signal is an analog signal or not. 4. The transmission / reception amplifier for adjusting a gain of a signal transmitted / received between the main control unit side circuit and the handset is provided in the main control unit side circuit. The facsimile apparatus described in the item. The multi-signal changeover switch or the A / D signal changeover switch is controlled to connect the main control unit side circuit and the handset when a handset call signal is detected, from the line side circuit. 2. A line control signal such as a hook signal and a ringing signal and a facsimile communication signal are detected, and switching control is performed so as to connect the main control unit side circuit and the facsimile apparatus main body. 5. A facsimile apparatus according to any one of claims 4 to 4.

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